// 实现mergePromise函数，把传进去的数组按顺序先后执行，并且把返回的数据先后放到数组data中。

const time = (timer) => {
  return new Promise((resolve) => {
    setTimeout(() => {
      resolve();
    }, timer);
  });
};

const ajax1 = () =>
  time(2000).then(() => {
    console.log(1);
    return 1;
  });

const ajax2 = () =>
  time(1000).then(() => {
    console.log(2);
    return 2;
  });

const ajax3 = () =>
  time(1000).then(() => {
    console.log(3);
    return 3;
  });

function* countAppleSales() {
  var saleList = [3, 7, 5];
  for (var i = 0; i < saleList.length; i++) {
    yield saleList[i];
  }
}

function mergePromise(ajaxArray) {
  const data = [];
  // 借助promise的链式操作
}

mergePromise([ajax1, ajax2, ajax3]).then((data) => {
  console.log("done");
  console.log(data); // data 为 [1, 2, 3]
});

// 要求分别输出
// 1
// 2
// 3
// done
// [1, 2, 3]
